
Last updated 2026-07-10
TL;DR
At 12 months, most children say at least one real word and understand simple instructions. By 18 months, the American Speech-Language-Hearing Association expects 10 to 25 words and comprehension of one-step commands. Missing these markers consistently is a reason to request a free evaluation, not a reason to wait and see.
What speech milestones should a 12-month-old hit?
At 12 months, the clearest milestone is a first real word. Not a babble sound your family has adopted as a word, but a sound your child uses consistently to mean something specific: "ma" for mom, "ba" for bottle, "uh" for up. One intentional, repeatable word is the benchmark [1].
Beyond that word, a typical 12-month-old is doing a lot of communicative work that doesn't sound like speech yet. They point at things they want. They wave bye-bye. They hold objects out to show you. These gestures matter enormously, because they tell you the child already understands communication is a two-way thing, before words are reliable [2].
Understanding, called receptive language, usually runs ahead of talking at this age. A 12-month-old should recognize their own name and respond when you say "no" or "come here." They look toward familiar people when named, and they often freeze or glance up when a familiar word lands in the middle of a sentence [1].
Babbling should be well established by now. You want varied consonant-vowel combinations, "dada," "mama," "baba," strings of syllables that rise and fall like real speech. Flat, monotone babbling, or babbling that dried up around 9 or 10 months, is worth writing down and mentioning.
What are the 18 month speech and language milestones?
By 18 months, the American Speech-Language-Hearing Association (ASHA) sets the expected vocabulary range at 10 to 25 words [1]. The AAP and CDC use similar figures, treating 18 months as the point where a child should say at least 10 words [3]. That 10-word floor is the number pediatricians actually watch.
A child who hasn't reached it at 18 months meets the common definition of a late talker, which puts them in a category where monitoring or evaluation is appropriate.
Here's what those words should look like in practice. They don't need perfect pronunciation. "Wawa" for water counts. "Buh" for bus counts, as long as the child uses it consistently and on purpose. What doesn't count: sounds only parents can decode, random vocalizations, or a word the child produced once and never repeated.
At 18 months, receptive language should have grown a lot. Your child should follow a one-step command with no gesture attached: "bring me your shoes" while you keep your hands still and your eyes off the shoes [1]. They should point to several body parts when named, recognize 50 or more words they can't yet say, and follow familiar routines from verbal cues alone [3].
Gestures keep expanding too. Pointing to request things (protoimperative pointing) is expected by 12 months. By 18 months a child should also point to share, jabbing a finger at a dog just so you'll look, not so you'll hand the dog over. That sharing gesture is called protodeclarative pointing. Its absence after 14 to 15 months is a recognized early sign of autism [2].
What's the normal word count progression from 12 to 18 months?
The growth curve between 12 and 18 months is steep, and it isn't a straight line. Many children sit at 1 to 4 words for most of this window, then hit a burst around 16 to 18 months where new words appear almost daily. That burst is real and well documented in language acquisition research [4].
| Age | Expected vocabulary (expressive words) | Receptive vocabulary |
|---|---|---|
| 12 months | 1-3 words | ~50 words understood |
| 14 months | 3-6 words | ~100 words understood |
| 16 months | 7-15 words | ~150 words understood |
| 18 months | 10-25 words | 200+ words understood |
These figures come from ASHA milestone data and line up with the MacArthur-Bates Communicative Development Inventories (CDI), a widely used research tool for early language [4][1]. The CDI data show enormous individual variation. Some children reach 50 words by 16 months. Others hit exactly 10 at 18 months and go on to have completely typical language. The width of the range is the point: normal is broad, but there is a floor.
The 50-word mark is worth naming here, even though it usually sits closer to 24 months. CDI norming studies found most children reach 50 words somewhere between 18 and 24 months, and that vocabulary size is tied to the arrival of two-word combinations [4]. What you see at 18 months previews where a child tends to land a few months later.
What speech red flags should parents watch for at 12-18 months?
Pediatric speech-language pathologists use a short list of observable behaviors to flag children who need a closer look. No single item on it is a diagnosis. They're signals.
At 12 months, the clearest red flags are: no babbling with consonants, no gestures like waving or pointing, no response to their own name when a calm, ordinary voice calls from across the room, and no single words [2][3]. If any of those are missing at 12 months, mention it to your pediatrician then. Don't hold the concern until 15 or 18 months.
By 15 months, a child with no words at all, or a child who had words and lost them, needs a referral for evaluation. Loss of any words or gestures at any age is an automatic red flag and one of the core early indicators in AAP autism screening guidance [3].
At 18 months specifically, watch for:
- Fewer than 10 words
- No pointing to share interest (only to request)
- Trouble following simple verbal directions without a gesture or visual cue
- Consistent frustration during communication attempts
- Very little variety in the sounds they use
One thing surprises parents often: a child who understands everything but says almost nothing is still a child worth evaluating. Comprehension running ahead of talking is normal. A huge gap is not. A child who clearly understands 200 words and says 3 by 18 months has an expressive language delay, even though comprehension is intact [1].
What's the difference between a late talker and a language disorder?
This distinction matters, because the intervention and the outlook can differ a lot.
A late talker is a child under 30 months with a smaller vocabulary than expected, but with typical understanding, play, social engagement, and hearing [5]. Many late talkers, by some estimates 50 to 70 percent, catch up without formal therapy. Researchers call them "late bloomers" [5]. That sounds reassuring until you hit the catch: you can't tell in advance which child will catch up on their own and which won't.
A language disorder involves difficulty that goes past word count. The child may struggle with understanding, use language in odd ways, have processing trouble, or carry an underlying condition like autism, childhood apraxia of speech, or hearing loss that's shaping language development [6]. For these children, wait-and-see does damage. Intervention before age 3 produces meaningfully better outcomes than the same intervention started at 4 or 5 [12].
If you've read about childhood apraxia of speech, you know it's a motor planning problem, not a comprehension problem. A child with apraxia may understand everything and want desperately to talk but can't reliably sequence the sounds. That's a different situation from a child who simply hasn't stacked up enough words yet.
Speech-language pathologists don't sort these categories by how worried a parent sounds. They use standardized assessments. That's the whole reason an evaluation matters. You get real data instead of guesses.
How does hearing affect speech at this age?
Hearing loss is the first thing an SLP will want to rule out when a child misses milestones, and it should be the first thing you think about too. Roughly 1 to 3 in every 1,000 US children are born with some degree of hearing loss, and not every case is caught at the birth screening [8].
Even mild or fluctuating hearing loss from repeated ear infections can shift early language. A child stuck in a cycle of fluid-in-the-ear across several months between 12 and 18 months may miss a lot of speech input during a window when it counts. This is different from permanent sensorineural hearing loss, but it can produce similar delays in the short run.
When a child isn't meeting speech milestones, ASHA recommends an audiological evaluation as part of the initial workup, before or alongside the speech-language evaluation [1]. Pediatric audiologists can test hearing in children far too young to raise a hand for a beep. These tests are separate from the screening done at birth.
Here's the practical version. If your 15-month-old doesn't reliably startle at loud sounds, doesn't turn toward your voice, or hears clearly in quiet but tunes out in noise, say so. Don't assume they're just ignoring you.
When should you request a speech evaluation?
Earlier than most parents think, and earlier than many pediatricians suggest.
Current AAP guidance recommends developmental surveillance at every well-child visit plus standardized developmental screening at 9, 18, and 30 months [3]. Surveillance is not evaluation. If you have a concern at 14 months, you don't have to wait for the 18-month visit to raise it.
ASHA's position is that any child not meeting age-level communication milestones should be referred for a full speech-language evaluation [1]. Sooner is better. The Part C program under the Individuals with Disabilities Education Act (IDEA) guarantees free evaluation and services for children under 3 with developmental delays, including speech and language delays [7]. You don't need a diagnosis to ask for it. In most states you don't need a pediatrician's referral either. You can call your state's early intervention program directly [7].
If your child is 18 months and says fewer than 10 words, that's a fair threshold to request an evaluation now, not at the next checkup. The evaluation is free through early intervention and it takes the guesswork out. If the child is fine, you'll know. If there's a delay, you caught it early enough for services to actually work.
For a walkthrough of that process, the early intervention article on this site covers how to make the call and what happens after.
What can parents do at home to support speech development?
There's a real body of research on this, and the strategies that keep showing up in studies of parent-implemented language intervention are specific enough to actually use.
Talk during routines, more than during playtime. Bath, diaper change, car rides: these are high-repetition moments where the same language shows up in the same context day after day. That repetition builds comprehension faster than any toy [9].
Use "parallel talk." Narrate what your child is doing, not what you're doing. "You're pushing the ball. The ball is rolling. It went far." You give the child words for their own experience without asking them to perform.
Cut screens for children under 18 to 24 months, with video calls to real people as the exception [10]. The AAP is blunt about this: background TV drops both the quality and the quantity of parent speech to the child, which drops language input. Educational baby videos don't reliably add vocabulary.
Follow the child's lead. If your child grabs a spoon and bangs it, the spoon is the topic. Talk about the spoon. Don't steer them toward the toy you think is more educational.
Cut questions, add comments. Parents of late talkers often quiz without meaning to: "What's that? What color? What do you want?" Comments ("That's a big truck") carry less pressure and pull more spontaneous language out of the child than questions do [9].
For parents who want structured daily support, apps like Little Words are built for this window, pairing modeling activities with progress tracking so you're doing more than improvising.
None of this replaces evaluation or therapy if your child has a delay. But every one of these fits any child in this age range, delayed or not.
Does bilingual or multilingual exposure delay speech?
No. Bilingual and multilingual children meet the same overall language milestones as monolingual children. The words are just spread across two languages [11]. A child who says 5 words in English and 6 in Spanish has 11 words, not 5 or 6.
ASHA puts it plainly: "a communication difference is not a communication disorder" [11]. When assessing a bilingual child, an SLP should account for both languages. An evaluation run only in English will systematically undercount the vocabulary of a child who also speaks Spanish, Mandarin, or anything else at home.
Bilingualism does not shield a child from delays. A child from a bilingual home who isn't meeting milestones in either language, counting every word from every language, still needs evaluation. The causes will be the same ones you'd look at in a monolingual child: hearing, motor, neurological, or environmental factors.
If you're concerned and your child hears more than one language, say so directly to your pediatrician and to any evaluating SLP. Ask how they count total vocabulary across languages. If they can't answer that cleanly, find a different evaluator.
Could a speech delay at 18 months indicate autism?
It might, and it's worth taking seriously without spiraling.
Speech and language differences are among the most common early signs of autism. The AAP recommends screening all children for autism at 18 and 24 months with a validated tool like the M-CHAT-R/F [3]. If your 18-month visit didn't include that screening, ask for it.
The signs that most often ride alongside a language delay in autism, as opposed to a plain late-talker profile, are social: reduced eye contact, limited pointing, not showing you things, not responding to their name, little imitation of actions or sounds, and a pull toward objects over people in play [2][3]. A child can be a late talker with none of these. A child with several of them plus a language delay has a profile that calls for a full developmental evaluation.
Echolalia, where a child repeats phrases from TV, books, or overheard speech instead of generating new language, shows up in typical development in small doses but runs longer and louder in some autistic children [6]. If your child's "words" mostly come from scripts, mention it to an evaluator. The echolalia and echolalia meaning articles go deeper.
For children who receive an autism diagnosis, autism spectrum speech therapy looks somewhat different from therapy for other causes of delay, and the earlier it starts, the stronger the evidence for outcomes.
One more thing. An 18-month evaluation doesn't hand you a diagnosis in a single visit. It starts a process. Starting early beats waiting, every time.
What happens during a speech-language evaluation for a toddler?
Most parents don't know what to expect, and that uncertainty is exactly what makes them wait too long.
An SLP evaluating a child in this age range does a few things [6]. First, they take a detailed case history from you: pregnancy and birth, feeding history, hearing, family history of speech or language delays, and your child's current communication in detail. Come with specifics. How many words does your child use, what are they, do they use them consistently.
Then they watch the child directly, usually through play. They're tracking eye contact, pointing, imitation, attention, how the child asks for something they want, and what happens when communication breaks down.
They may run a standardized assessment. For toddlers, common options are the Bayley Scales of Infant and Toddler Development, the Preschool Language Scales (PLS-5), and the Rossetti Infant-Toddler Language Scale. These compare the child against normed data from same-age peers [6].
At the end, the SLP tells you whether the child's skills fall within typical limits, and if not, how big the gap is and what they'd recommend: monitoring, parent coaching, or direct therapy.
Through early intervention (children under 3), services happen in the "natural environment," often your home, and are free or very low cost regardless of insurance [7]. For what ongoing work with an SLP looks like, see the speech therapy speech therapist article.
The evaluation isn't scary. It's information. Go get it.
Frequently asked questions
How many words should a 12-month-old say?
At 12 months, the benchmark is at least one real word, used consistently and on purpose. Some children have 2 to 4 words by then. The word doesn't need clean pronunciation: "ba" for ball counts if the child uses it reliably for that object. What matters as much as words is whether the child is babbling, pointing, and responding to their name.
Is it normal for a 15-month-old to not be talking?
It depends on what "not talking" means. A 15-month-old with no words at all sits below the expected range and is worth raising at the next pediatric visit rather than waiting for 18 months. A child with 2 to 4 words plus good comprehension and pointing is on the low end of normal and should be watched closely. Any child who had words and lost them needs evaluation promptly.
What counts as a word for a 16-month-old?
A word counts when the child uses a consistent sound to mean a specific thing, every time. "Da" for dog, said whenever the dog appears, counts. "Wawa" for water counts. A word said once and never again does not count toward vocabulary. Family-specific invented words count. The test is consistency and intention, not how accurate the pronunciation is.
My 18-month-old understands everything but doesn't talk. Should I worry?
Strong comprehension is a good sign, but it doesn't cancel out an expressive delay. A child who understands 200-plus words but says fewer than 10 by 18 months has an expressive language delay, even with intact receptive language. This profile sometimes clears on its own, but some children in this group go on to need therapy. An evaluation gives you real information instead of guesses.
What is the difference between a speech delay and a language delay?
Speech delay means trouble with the sounds and articulation of words: pronunciation, clarity, the motor coordination for talking. Language delay means trouble with the communication system itself: vocabulary size, understanding sentences, combining words. Many young children have both. A speech-language pathologist evaluates both areas and can tell you which one, or both, is affecting a given child.
Can watching TV cause a speech delay at this age?
There's no clean evidence that screen time causes delays in otherwise typical children, but the AAP recommends avoiding solo screen use under 18 to 24 months for a practical reason: time in front of a screen is time not talking with a real person, and conversational interaction drives early language. Background TV has also been shown to lower both the quantity and quality of parent speech to the child.
How do I get a free speech evaluation for my toddler?
In the US, the Individuals with Disabilities Education Act (IDEA) Part C requires every state to provide free evaluations and services for children under 3 with developmental delays, including speech and language delays. You can self-refer by calling your state's early intervention program directly. You don't need a diagnosis or a pediatrician's referral. Services, if recommended, are free or minimal cost based on family income.
Do bilingual children hit speech milestones later?
No. Bilingual children meet the same overall milestones, but words may split across two languages. A child with 8 words in English and 7 in Spanish has 15 words total, which clears the 18-month benchmark. When assessing a bilingual child, any speech-language pathologist should count vocabulary across all languages. Bilingualism itself does not cause speech delay.
What are the earliest signs of autism related to speech?
The AAP recommends autism screening at 18 and 24 months. Early language-related signs include not responding to their name consistently, limited pointing to share interest, reduced imitation, and loss of words or gestures already acquired. Combined with reduced eye contact or social engagement, these form a profile worth evaluating. A speech delay alone can't diagnose autism, but the overlap is common enough that both should be assessed together.
My child says a lot of sounds but no clear words at 18 months. Is that a problem?
Yes, this warrants evaluation. Rich babbling and vocal play are positive signs, but by 18 months a child should have at least 10 words used intentionally and consistently. Lots of vocalizing with no clear words sometimes means the child has good oral motor skills but hasn't yet mapped sounds to meaning, or there's an expressive language difficulty. An SLP can tell these possibilities apart.
How does early intervention help with speech delays?
Early intervention services for children under 3 usually involve a speech-language pathologist working with the child at home or in another natural setting, often alongside parent coaching. Research consistently finds intervention before age 3 produces better outcomes than the same intervention started later, because the brain is in a phase of fast language network development. Services are free or low cost through IDEA Part C.
What's the vocabulary explosion and when does it happen?
The vocabulary explosion, sometimes called the naming explosion, is a stretch when a child goes from adding words slowly to learning several new ones per week. In most children it lands between 16 and 24 months, often after they reach around 50 words. MacArthur-Bates CDI norming studies show it's linked to the arrival of two-word combinations. Not every child has a dramatic burst; some add words steadily across this period.
Should I use baby sign language if my child isn't talking?
Using a small set of functional signs alongside speech is generally supported by speech-language pathologists for children delayed in expressive language. The evidence does not show signing delays speech; some research suggests it lowers frustration and may support language learning. Always pair signs with the spoken word rather than replacing it. This differs from AAC devices used for children with more significant communication needs.
Sources
- American Speech-Language-Hearing Association (ASHA), speech and language milestones: ASHA normative expectations for vocabulary (10-25 words by 18 months), receptive language, and gesture development from 12 to 18 months
- CDC, Learn the Signs Act Early: developmental milestones: CDC milestone checklists for 12 and 18 months including pointing, name response, and gesture expectations; protodeclarative pointing as red flag for autism
- American Academy of Pediatrics (AAP), developmental surveillance and screening policy: AAP recommendation for developmental screening at 9, 18, and 30 months; autism screening at 18 and 24 months using M-CHAT-R/F; 10-word minimum at 18 months
- MacArthur-Bates Communicative Development Inventories (CDI), norming data: CDI norming studies showing vocabulary size progression from 12 to 18 months, the vocabulary burst, and relationship between 50-word vocabulary and two-word combination emergence
- Rescorla, L. (2011). Late talkers: Do good predictors of outcome exist? Developmental Disabilities Research Reviews, 17(2), 141-150.: Estimate that 50-70% of late talkers catch up without intervention (late bloomers), and the difficulty of predicting which children will catch up without evaluation
- ASHA, speech-language pathology scope of practice: Description of assessment tools used for toddlers including PLS-5, Bayley Scales, and Rossetti, and the SLP's role in differentiating late talker from language disorder
- US Department of Education, IDEA Part C early intervention program: IDEA Part C guarantees free evaluation and services for children under 3 with developmental delays including speech-language delays; parent self-referral is permitted
- CDC, Hearing Loss in Children data and statistics: Approximately 1 to 3 per 1,000 children born in the US have detectable hearing loss; fluctuating hearing loss from ear infections can affect early language development
- Girolametto, L., & Weitzman, E. (2002). Responsiveness of child care providers in interactions with toddlers. American Journal of Speech-Language Pathology, 11(3), 268-280.: Parent comment (parallel talk) vs question strategies: comments generate more spontaneous child language than questions; follow the child's lead is a supported parent coaching technique
- American Academy of Pediatrics, media and young minds policy statement (Pediatrics, 2016): AAP recommendation to avoid solo screen use before 18-24 months; background TV reduces quality and quantity of parent speech to the child
- ASHA, bilingual and multilingual communication development: ASHA position that a communication difference (bilingualism) is not a communication disorder; vocabulary should be counted across all languages in assessment
- Warren, S. F., & Brady, N. C. (2007). The role of maternal responsivity in the development of children with intellectual disabilities. Mental Retardation and Developmental Disabilities Research Reviews, 13(4), 330-338.: Evidence that early intervention before age 3 produces significantly better language outcomes than the same intervention started later
